Electric lamp



July 8, 1947.

G. c. SINGER ELECTRIC LAMP Filed Feb. 15. 1945 I Patented July 8, 1947 v UNITED STATES PATENT ELECTRIC LAMP Grover 0. Singer, Brownsville, Tex.

Application February 13, 1945, Serial No. 577,654

-2 Claims.

This invention relates to electric lamps.

An object of the invention is the provision of an electric lamp adapted for particular use in headlights of automobiles in which a reflecting disk is located centrally of the outer end of a transparent globe formed integrally with a base, the bottom of the globe being provided with a reflecting surface extending outwardly along the inner side walls of the globe and an additional refleeting surface projecting outwardly from the bottom of the globe and below the disk and in association with filaments.

Another object of the invention is the provision of an electric lamp including a globe and base member formed of transparent materials with the outer end of the globe being substantially flattened and providing a reflecting disk for eliminating direct bllndingrays from the filaments included in the globe.

A further object of the invention is the provision of an electric lamp including a globe and an integrally formed base member, an extension rising from the bottom of the globe and provided with reflecting materials located directly under a disk formed of reflecting materials and located on an outer flat face of the globe.

Another object of the invention is the provision of an electric lamp including a bulb and integrally formed base member which is provided with a central longitudinal passage, said passage being closed by a plug having a hollow portion extending into the globe with reflecting materials applied to certain of the walls of the hollow portion, said hollow portion of the plug being located directly beneath a disk of reflecting materials which is applied to the inner face of a flat outer end portion of the globe.

This invention will be best understood from a consideration of the following detailed description, of the accompanying drawings forming a part of the specification; nevertheless, it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

Fig. 1 is .1 horizontal section of an electric lamp takenalong the line ll of Fig. 2.

Fig. 2 is a vertical section taken along the line 2-2 of Fig- 1.

Fig. 3 is a vertical -section similar to that shown in Fig. 2, but of a modified form of the electric lamp.

Fig. 4 is a vertical section of another modified form of the electric lamp.

Figs. 5 and 6 are vertical sections of still other forms of the electric lamp.

Fig. 7 is a fragmentary vertical section of a lamp showing a hollow chamber on the inner end of a plug sealed within a passage of the base member.

Referring more particularly to Figs. 1 and 2, it will be seen that l0 designates a base member which is formed integrally with a globe l l formed of transparent materials. The outer end of the globe as shown at It is substantially flat and is formed independently of the globe. The member 12 is fused on to the outer edge of the globe ii.

The base member It is provided with an axial passage iii in which is mounted a plug EH3. This plug is sealed to the walls of the passage 93 and has a centrally disposed passage 55 for the pur pose of withdrawing the air from the globe ii in the usual manner. After the air has been exhausted from the globe this passage is sealed,

The inner side wall of the globe H is coated with a reflecting material I! as is the bottom it of the bulb as shown at l9. A disk 20 formed of reflecting materials is secured by fusing or cementing it to the inner face of the member 62 directly over the plug it, in order to reflect back strong light rays, and thus eliminate a concentrated light forwardly of the automobile.

A substantially semi-spherical element 23 is located within the globe H and the flat bottom 24 of said element is sealed to the reflecting materials IS on the bottom of the globe H. The element 23 presents a substantially rounded surface to the outer end l2 of the globe. It will be noted that the passage i5 is continued through the element 23 as shown at 25, since all of the parts of the lamp must be assembled before the bulb II is exhausted.

The filaments 30 and 3! are supported between the respective posts 32, 33 and 3 3. Fila ments 35 and 38 are supported between the respective pairs of posts ESL-38 and 3B-39. In each case the post 33 forms a common support for both the filaments Sll and ti while post it forms a common support for filaments 35 and it.

It will be noted that wires 50 and (ii ar con nected to the respective contacts E2 and t3, while wire 44 is imbedded in the base member it and is connected with a threaded sleeve t5 which surrounds the reduced portion $6 of the base member I 0.

It will be noted that the wires to and ii extend through the respective posts 35 and 33, with v the outer ends of the wires being split as shown at 41 and bent over the outer ends of the hollow posts in order to maintain the posts in position.

A split lug 48 extending from the post 34 receives one end of the filament 3!. A split lug 49 extending from the post 33 is adapted to clamp the other end of the filament 3|.

A split lug 50 extending from the post 33 and a split lug 5] extending from the post 32 are clamped upon the opposite ends of the filament 30.

Since the posts 31, 38 and the split lugs connected with said posts are similar in construction to the arrangement shown at the left hand side in Fig. 1. the same reference numerals will be applied to the posts at the right hand side in Figs. 1 and 2, since the fllaments arrangement and the supports on both sides of the bulb are identical in construction, except that the exponent a is applied to the numerals.

The construction and arrangement of the filaments, the lead-in wires, posts and the connections are described and illustrated in my Patent No. 2,368,685 of February 6, 1945.

The hemispherical member 23 which overlies the reflecting materials I9 on the flattened bottom 24 of the bulb will tend to project strong light rays forwardly, but due to thereflector 20 on the member .i2 the centrally disposed light rays will be reflected back into the interior of the bulb.

Furthermore, the incurved side walls of the globe II will also tend to reflect rays rearwardly so that no strong light will be reflected from the lamp.

' In Fig. 3 is shown a modified form of an electric lamp in which a base member ID"- is formed integrally with a bulb portion I I. The outer end or flat transparent cover plate l2 may be fused on to the outer end of the bulb H or this cover plate may be formed integrally with the bulb. since the base portion l0"- has a central passage G0 which has a diameter sufliciently great'so that all of the elements which are necessary to be placed in the bulb ll may be inserted through this passage which is closed by a plug 6|, which may be formed of transparent materials. The cover plate l2 of the bulb is provided with a reflecting disk 20. Since the arrangement and elements for supporting the filaments are substantially the same as that shown in Figs. 1 and 2, the same reference numerals are applied to the respective elements.

The distinction between Fig. 3 and Figs. 1 and 2 resides in the plug 6! and the substantially conically shaped projection 62.-

The inner end of the plug 6| is provided with. a curved seat 63 upon which is mounted the projection 62 having reflecting materials 64 mounted on the bottom of the projection which is sealed to the seat 63 in any approved manner.

The plug BI is provided with a central passage 65 which alines with a central passage 66 formed in the projection 62 so that air may be exhausted from the bulb II. This passage 65 is closed by the usual cement as shown at 61.

It will be noted that the projection 82 is not only conically shaped, but is corrugated as shown at 61*, so that rays from the filaments which strike the corrugated section 61* will be diffused and therefore eliminate any blinding rays from the lamp. Furthermore, the incurved side walls of the bulb II which are covered with reflectin: materials l9 will cooperate with the reflect- 4 ing disk Ml ror further aiding in eliminating blinding rays emanating from the lamp.

Referring more particularly to Fig. 4, it will be seen that the difference between this construction and that shown in Fig. 2 is the addition of the plug 10 and a chamber ll formed in the inner end of the plug and located within the bulb Il Since all of the other elements of the lamp are substantially the same as those shown in Fig. 2 the same reference numerals are applied thereto. However, the extension 12 of the plug 10 replaces the element 23 shown in Fig. 2.

The plug 10 is sealed to the walls of the central passage l3 in the base member Ill". The plug has a narrow longitudinal passage 13 which opens at 14 in the chamber ll into the interior of the globe I I for exhausting air from the globe. This passage is then sealed by the usual form of cement.

The inner end 12 of the plug 10 is provided with a chamber H and the inner top wall 15 of this chamber is curved asis the outer end 16 of the plug. The inner side wall of the chamber H and the bottom of the chamber is coated with reflecting materials as indicated at 11. The reflecting disk 20 is located at the inner face of the flat closure ll 0n the outer end of the bulb I I and directly over the outer end of the plug 10.

It will be seen by this construction that light rays from the filaments are not only reflected by the reflecting materials [9 on the bottom l8 of the globe li but they are reflected by the reflecting materials on the side and bottom walls of the chamber H. The reflecting materials I! on the inwardly curved side walls of the bulb H reflect light rays rearwardly and toward the projection 12 of the plug 10.

The various wires connecting the contacts 42 and the threaded sleeve 45 with the respective posts have the same reference numerals as do the wires illustrated in Figs. 1 to 3 inclusive.

Referring more particularly to Fig. 5, it will be seen that a modified form of the plug is employed. However, the lead-in wires, the posts and the filaments are identical in construction to those shown in Figs. 1 to 4 inclusive, and therefore the same reference numerals are employed. The plug is received within the passage l3 in the base portion Ill and is sealed therein. The inner end of the plug projects into the bulb ll and is provided with a chamber 8|. The bottom of the chamber as shown at 82 is curved and is provided with reflecting materials indicated at 85, after which the member 831s sealed in place.

It will be noted that the plug 80 and likewise the concavo-convex member 83 hav the respectively alined passages 86 and 81 so that air may be exhausted from the bulb II. The passage in the plug 80 is closed by the usual form of cement.

Light rays from the filaments are reflected by the reflector and due to the highly polished concave surface 84 of th member 83, said surface will also reflect the light rays. Light rays strike the reflecting materials I! on the inner wall of the bulb ll and these rays are reflected inwardly due to the incurved walls of the bulb. Any intense rays which are reflected outwardly strike the reflecting disk 20, and these rays ar returned so that the 'rays which are projected through the transparent cover plate I2 wil1 not have a blinding effect.

In view of the fact that the passage I3 in the base portion I0 is relatively wide, the posts 32 to 34 inclusive, and 31 to 39inclusive may be inserted through the passage and applied in position. The plug 80 and th member 83 may be completely formed exteriorly of the lamp and inserted in position. Thus, the member I2 may be formed integrally with the globe II c and the bas 40.

Referring more particularly to Fig. 6, it will be seen that a modified form of the plug is employed in the passage I3 of the base portion I which is formed integrally with the globe I I The outer end I2 of the globe may be formed integrally with said globe since the plug 90 is inserted into the passage I3.

The plug 90 extends into the globe I I as shown at 9|, and the extended portion is provided with a chamber 92 in which are mounted posts 93 and 94 for carrying the filaments 95 at the upper ends of the posts. The bottom 96 of the chamber 92 is coated with reflectin materials as indicated at 91.

A wire 98 connects the contact 99 at the outer end of the plug to the post 94. A wire I 00 is embedded in the plug 90 as is the wire 98 and extends upwardly into the chamber 92 and is connected to the post 93. The wires 98 and I00 have split ends which are bent over the outer ends of the posts 94 and 93 for retaining the posts in position as shown more particularly in Fig. 3. The lower end of the wire I00 is connected to a strip of metal IOI which is embedded in the plug 90 so that there will be sufllcient contacting surface for the short wire I02 embedded in the base I0 to make electrical contact with the wire I00. The wire I02 is in contact with the threaded sleeve 45.

Referring more particularly to Fig. 7, it will be seen that a fragmentary bulb is shown having a base member I0 formed of transparent materials and integrally formed with a globe H A plug I05 is located within a central passage I06 in the base I0 and is sealed thereto. This form of lamp is substantially the same as that shown in Fig. 6, except that the walls I01 01 the chamber I08 are progressively divergent from the bottom to the outer end and the side walls are corrugated instead of being straight as shown in Fig. 6. The rest of the elements shown in Fig. 7 are identical with those shown in Fig. 6, and therefore the sam reference numerals will be applied. In this case, however, the inner side walls of the chamber I08 are coated with reflecting materials I09.

In all of the constructions it will be seen that the lamp uniformly contains the-reflecting disk 20 at the outer and inner side of the outer end of the globe for reflecting rearwardly intense rays from the filaments. The lamps further are provided with interior reflectors at the center of the base of the globe directly beneath the disk 20 20, 20, or 20 as the case may be for spreading the rays outwardly to the side walls of the globe which are likewise provided with reflecting materials for aiding in eliminating any blinding rays from the lamp. It will also be noted that the reflecting materials have been eliminated on sections of the base member where the posts which are formed of conductive material are mounted on said base in order to prevent; short circuiting.

In Figure 6, the extension 9| may be made of colored glass and the disk may be a colored insert. The colors will aid in reducing the glare of the lamp.

' a reflecting coating provided on the side walls of the bulb only to a point above the end of the plug, and an opaque reflecting surface at the center of the outer end of the bulb in alinement with the filament and the reflecting surface on said inner extension, whereby those light rays passing through the colored glass and falling .on the reflecting surface of the side Walls of the bulb and those reflected from the central reflecting surfaces at the center of the bulb and the .end of said plug will be projected outwardly through the clear space of the outer end of the bulb together with the normal rays from the filament to provide a soft light glow emanating from the lamp.

2. An electric lamp comprising a bulb having a flat inner bottom, side walls curving inwardly therefrom and a flat top parallel to said bottom, a tubular stem extending outwardly therefrom, a filament within the bulb, a plug of transparent material sealed within the stem having an inner end projecting into the bulb, reflecting coatings on the bottom and side walls of the bulb, a similar surface on the inner end of the plug above the flat bottom of said bulb and an opaque reflecting surface on the inner side of the flat top of the bulb in line with the reflecting surface on the end of said plug.

GROVER' C. SINGER.

REFEREN S CITED The following references are 01 record in the flle of this patent:

UNITED STATES PATENTS Number Name Date 414,742 Wilson Nov. 12, 1889 1,436,308 Evans Nov. 21, 1922 1,665,799 Smith Apr. 10, 1928 1,712,027 Cooke May 7, 1929 1,835,705 Gilleland et a1 Dec. 8, 1931 2,120,836 Grimes June 14, 1938 242,051 Salathe et al May 24, 1881 2,362,175 Swanson Nov. 7, 1944 2,144,400 Birdseye l Jan. 17, 1939 1,863,423 Van Eck et al June 14, 1932 

